You can easily find out what backlinks your competition has by using on the many tools on the market.
1. Majestic SEO
2. Ahrefs
3. Open Site Explorer
4. SEMrush
5. Backlink Watch
6. Rank Signals
7. Open Link Profiler
8. Buzz Sumo

Well, all the people above suggested everything. My opinion is to go with the free version first if you like the tool then purchase it and get more benefits. For example, Moz is a free tool that you can use to find more backlinks but if purchase its premium version they gave extra things with there free version, so first find out such websites. In my opinion, Moz, Alexa, Majestic, Similarweb are the best. Now it's your choice.

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